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                        <h1 id="%E5%87%BD%E6%95%B0%E7%9A%84%E6%89%A9%E5%B1%95">&#x51FD;&#x6570;&#x7684;&#x6269;&#x5C55;</h1>
<h2 id="%E5%87%BD%E6%95%B0%E5%8F%82%E6%95%B0%E7%9A%84%E9%BB%98%E8%AE%A4%E5%80%BC">&#x51FD;&#x6570;&#x53C2;&#x6570;&#x7684;&#x9ED8;&#x8BA4;&#x503C;</h2>
<p>&#x5728;ES6&#x4E4B;&#x524D;&#xFF0C;&#x4E0D;&#x80FD;&#x76F4;&#x63A5;&#x4E3A;&#x51FD;&#x6570;&#x7684;&#x53C2;&#x6570;&#x6307;&#x5B9A;&#x9ED8;&#x8BA4;&#x503C;&#xFF0C;&#x53EA;&#x80FD;&#x91C7;&#x7528;&#x53D8;&#x901A;&#x7684;&#x65B9;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">log</span>(<span class="hljs-params">x, y</span>) </span>{
  y = y || <span class="hljs-string">&apos;World&apos;</span>;
  <span class="hljs-built_in">console</span>.log(x, y);
}

log(<span class="hljs-string">&apos;Hello&apos;</span>) <span class="hljs-comment">// Hello World</span>
log(<span class="hljs-string">&apos;Hello&apos;</span>, <span class="hljs-string">&apos;China&apos;</span>) <span class="hljs-comment">// Hello China</span>
log(<span class="hljs-string">&apos;Hello&apos;</span>, <span class="hljs-string">&apos;&apos;</span>) <span class="hljs-comment">// Hello World</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x68C0;&#x67E5;&#x51FD;&#x6570;log&#x7684;&#x53C2;&#x6570;y&#x6709;&#x6CA1;&#x6709;&#x8D4B;&#x503C;&#xFF0C;&#x5982;&#x679C;&#x6CA1;&#x6709;&#xFF0C;&#x5219;&#x6307;&#x5B9A;&#x9ED8;&#x8BA4;&#x503C;&#x4E3A;World&#x3002;&#x8FD9;&#x79CD;&#x5199;&#x6CD5;&#x7684;&#x7F3A;&#x70B9;&#x5728;&#x4E8E;&#xFF0C;&#x5982;&#x679C;&#x53C2;&#x6570;y&#x8D4B;&#x503C;&#x4E86;&#xFF0C;&#x4F46;&#x662F;&#x5BF9;&#x5E94;&#x7684;&#x5E03;&#x5C14;&#x503C;&#x4E3A;false&#xFF0C;&#x5219;&#x8BE5;&#x8D4B;&#x503C;&#x4E0D;&#x8D77;&#x4F5C;&#x7528;&#x3002;&#x5C31;&#x50CF;&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;&#x6700;&#x540E;&#x4E00;&#x884C;&#xFF0C;&#x53C2;&#x6570;y&#x7B49;&#x4E8E;&#x7A7A;&#x5B57;&#x7B26;&#xFF0C;&#x7ED3;&#x679C;&#x88AB;&#x6539;&#x4E3A;&#x9ED8;&#x8BA4;&#x503C;&#x3002;</p>
<p>&#x4E3A;&#x4E86;&#x907F;&#x514D;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#xFF0C;&#x901A;&#x5E38;&#x9700;&#x8981;&#x5148;&#x5224;&#x65AD;&#x4E00;&#x4E0B;&#x53C2;&#x6570;y&#x662F;&#x5426;&#x88AB;&#x8D4B;&#x503C;&#xFF0C;&#x5982;&#x679C;&#x6CA1;&#x6709;&#xFF0C;&#x518D;&#x7B49;&#x4E8E;&#x9ED8;&#x8BA4;&#x503C;&#x3002;&#x8FD9;&#x6709;&#x4E24;&#x79CD;&#x5199;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-comment">// &#x5199;&#x6CD5;&#x4E00;</span>
<span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> y === <span class="hljs-string">&apos;undefined&apos;</span>) {
  y = <span class="hljs-string">&apos;World&apos;</span>;
}


<span class="hljs-comment">// &#x5199;&#x6CD5;&#x4E8C;</span>
<span class="hljs-keyword">if</span> (<span class="hljs-built_in">arguments</span>.length === <span class="hljs-number">1</span>) {
  y = <span class="hljs-string">&apos;World&apos;</span>;
}
</code></pre>
<p>ES6&#x5141;&#x8BB8;&#x4E3A;&#x51FD;&#x6570;&#x7684;&#x53C2;&#x6570;&#x8BBE;&#x7F6E;&#x9ED8;&#x8BA4;&#x503C;&#xFF0C;&#x5373;&#x76F4;&#x63A5;&#x5199;&#x5728;&#x53C2;&#x6570;&#x5B9A;&#x4E49;&#x7684;&#x540E;&#x9762;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">log</span>(<span class="hljs-params">x, y = &apos;World&apos;</span>) </span>{
  <span class="hljs-built_in">console</span>.log(x, y);
}

log(<span class="hljs-string">&apos;Hello&apos;</span>) <span class="hljs-comment">// Hello World</span>
log(<span class="hljs-string">&apos;Hello&apos;</span>, <span class="hljs-string">&apos;China&apos;</span>) <span class="hljs-comment">// Hello China</span>
log(<span class="hljs-string">&apos;Hello&apos;</span>, <span class="hljs-string">&apos;&apos;</span>) <span class="hljs-comment">// Hello</span>
</code></pre>
<p>&#x53EF;&#x4EE5;&#x770B;&#x5230;&#xFF0C;ES6&#x7684;&#x5199;&#x6CD5;&#x6BD4;ES5&#x7B80;&#x6D01;&#x8BB8;&#x591A;&#xFF0C;&#x800C;&#x4E14;&#x975E;&#x5E38;&#x81EA;&#x7136;&#x3002;&#x4E0B;&#x9762;&#x662F;&#x53E6;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">Point</span>(<span class="hljs-params">x = 0, y = 0</span>) </span>{
   <span class="hljs-keyword">this</span>.x = x;
   <span class="hljs-keyword">this</span>.y = y;
}

<span class="hljs-keyword">var</span> p = <span class="hljs-keyword">new</span> Point(); 
<span class="hljs-comment">// p = { x:0, y:0 }</span>
</code></pre>
<p>&#x5229;&#x7528;&#x53C2;&#x6570;&#x9ED8;&#x8BA4;&#x503C;&#xFF0C;&#x53EF;&#x4EE5;&#x6307;&#x5B9A;&#x67D0;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x4E0D;&#x5F97;&#x7701;&#x7565;&#xFF0C;&#x5982;&#x679C;&#x7701;&#x7565;&#x5C31;&#x629B;&#x51FA;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">throwIfMissing</span>(<span class="hljs-params"></span>) </span>{
    <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">Error</span>(<span class="hljs-string">&apos;Missing parameter&apos;</span>);
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">foo</span>(<span class="hljs-params">mustBeProvided = throwIfMissing(</span>)) </span>{
    <span class="hljs-keyword">return</span> mustBeProvided;
}

foo()
<span class="hljs-comment">// Error: Missing parameter</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;foo&#x51FD;&#x6570;&#xFF0C;&#x5982;&#x679C;&#x8C03;&#x7528;&#x7684;&#x65F6;&#x5019;&#x6CA1;&#x6709;&#x53C2;&#x6570;&#xFF0C;&#x5C31;&#x4F1A;&#x8C03;&#x7528;&#x9ED8;&#x8BA4;&#x503C;throwIfMissing&#x51FD;&#x6570;&#xFF0C;&#x4ECE;&#x800C;&#x629B;&#x51FA;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;&#x3002;</p>
<p>&#x4ECE;&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8FD8;&#x53EF;&#x4EE5;&#x770B;&#x5230;&#xFF0C;&#x53C2;&#x6570;mustBeProvided&#x7684;&#x9ED8;&#x8BA4;&#x503C;&#x7B49;&#x4E8E;throwIfMissing&#x51FD;&#x6570;&#x7684;&#x8FD0;&#x884C;&#x7ED3;&#x679C;&#xFF08;&#x5373;&#x51FD;&#x6570;&#x540D;&#x4E4B;&#x540E;&#x6709;&#x4E00;&#x5BF9;&#x5706;&#x62EC;&#x53F7;&#xFF09;&#xFF0C;&#x8FD9;&#x8868;&#x660E;&#x53C2;&#x6570;&#x7684;&#x9ED8;&#x8BA4;&#x503C;&#x4E0D;&#x662F;&#x5728;&#x5B9A;&#x4E49;&#x65F6;&#x6267;&#x884C;&#xFF0C;&#x800C;&#x662F;&#x5728;&#x8FD0;&#x884C;&#x65F6;&#x6267;&#x884C;&#xFF08;&#x5373;&#x5982;&#x679C;&#x53C2;&#x6570;&#x5DF2;&#x7ECF;&#x8D4B;&#x503C;&#xFF0C;&#x9ED8;&#x8BA4;&#x503C;&#x4E2D;&#x7684;&#x51FD;&#x6570;&#x5C31;&#x4E0D;&#x4F1A;&#x8FD0;&#x884C;&#xFF09;&#xFF0C;&#x8FD9;&#x4E0E;python&#x8BED;&#x8A00;&#x4E0D;&#x4E00;&#x6837;&#x3002;</p>
<p>&#x53E6;&#x4E00;&#x4E2A;&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x5730;&#x65B9;&#x662F;&#xFF0C;&#x53C2;&#x6570;&#x9ED8;&#x8BA4;&#x503C;&#x6240;&#x5904;&#x7684;&#x4F5C;&#x7528;&#x57DF;&#xFF0C;&#x4E0D;&#x662F;&#x5168;&#x5C40;&#x4F5C;&#x7528;&#x57DF;&#xFF0C;&#x800C;&#x662F;&#x51FD;&#x6570;&#x4F5C;&#x7528;&#x57DF;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-keyword">var</span> x = <span class="hljs-number">1</span>;

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">foo</span>(<span class="hljs-params">x, y = x</span>) </span>{
  <span class="hljs-built_in">console</span>.log(y);
}

foo(<span class="hljs-number">2</span>) <span class="hljs-comment">// 2</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x53C2;&#x6570;y&#x7684;&#x9ED8;&#x8BA4;&#x503C;&#x7B49;&#x4E8E;x&#xFF0C;&#x7531;&#x4E8E;&#x5904;&#x5728;&#x51FD;&#x6570;&#x4F5C;&#x7528;&#x57DF;&#xFF0C;&#x6240;&#x4EE5;x&#x7B49;&#x4E8E;&#x53C2;&#x6570;x&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x5168;&#x5C40;&#x53D8;&#x91CF;x&#x3002;</p>
<p>&#x53C2;&#x6570;&#x9ED8;&#x8BA4;&#x503C;&#x53EF;&#x4EE5;&#x4E0E;&#x89E3;&#x6784;&#x8D4B;&#x503C;&#xFF0C;&#x8054;&#x5408;&#x8D77;&#x6765;&#x4F7F;&#x7528;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">foo</span>(<span class="hljs-params">{x, y = 5}</span>) </span>{
  <span class="hljs-built_in">console</span>.log(x, y);
}

foo({}) <span class="hljs-comment">// undefined, 5</span>
foo({x: <span class="hljs-number">1</span>}) <span class="hljs-comment">// 1, 5</span>
foo({x: <span class="hljs-number">1</span>, y: <span class="hljs-number">2</span>}) <span class="hljs-comment">// 1, 2</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;foo&#x51FD;&#x6570;&#x7684;&#x53C2;&#x6570;&#x662F;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x53D8;&#x91CF;x&#x548C;y&#x7528;&#x4E8E;&#x89E3;&#x6784;&#x8D4B;&#x503C;&#xFF0C;y&#x6709;&#x9ED8;&#x8BA4;&#x503C;5&#x3002;</p>
<h2 id="rest%E5%8F%82%E6%95%B0">rest&#x53C2;&#x6570;</h2>
<p>ES6&#x5F15;&#x5165;rest&#x53C2;&#x6570;&#xFF08;...&#x53D8;&#x91CF;&#x540D;&#xFF09;&#xFF0C;&#x7528;&#x4E8E;&#x83B7;&#x53D6;&#x51FD;&#x6570;&#x7684;&#x591A;&#x4F59;&#x53C2;&#x6570;&#xFF0C;&#x8FD9;&#x6837;&#x5C31;&#x4E0D;&#x9700;&#x8981;&#x4F7F;&#x7528;arguments&#x5BF9;&#x8C61;&#x4E86;&#x3002;rest&#x53C2;&#x6570;&#x642D;&#x914D;&#x7684;&#x53D8;&#x91CF;&#x662F;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#xFF0C;&#x8BE5;&#x53D8;&#x91CF;&#x5C06;&#x591A;&#x4F59;&#x7684;&#x53C2;&#x6570;&#x653E;&#x5165;&#x6570;&#x7EC4;&#x4E2D;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">add</span>(<span class="hljs-params">...values</span>) </span>{
   <span class="hljs-keyword">let</span> sum = <span class="hljs-number">0</span>;

   <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> val <span class="hljs-keyword">of</span> values) {
      sum += val;
   }

   <span class="hljs-keyword">return</span> sum;
}

add(<span class="hljs-number">2</span>, <span class="hljs-number">5</span>, <span class="hljs-number">3</span>) <span class="hljs-comment">// 10</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;add&#x51FD;&#x6570;&#x662F;&#x4E00;&#x4E2A;&#x6C42;&#x548C;&#x51FD;&#x6570;&#xFF0C;&#x5229;&#x7528;rest&#x53C2;&#x6570;&#xFF0C;&#x53EF;&#x4EE5;&#x5411;&#x8BE5;&#x51FD;&#x6570;&#x4F20;&#x5165;&#x4EFB;&#x610F;&#x6570;&#x76EE;&#x7684;&#x53C2;&#x6570;&#x3002;</p>
<p>&#x524D;&#x9762;&#x8BF4;&#x8FC7;&#xFF0C;rest&#x53C2;&#x6570;&#x4E2D;&#x7684;&#x53D8;&#x91CF;&#x4EE3;&#x8868;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#xFF0C;&#x6240;&#x4EE5;&#x6570;&#x7EC4;&#x7279;&#x6709;&#x7684;&#x65B9;&#x6CD5;&#x90FD;&#x53EF;&#x4EE5;&#x7528;&#x4E8E;&#x8FD9;&#x4E2A;&#x53D8;&#x91CF;&#x3002;&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x5229;&#x7528;rest&#x53C2;&#x6570;&#x6539;&#x5199;&#x6570;&#x7EC4;push&#x65B9;&#x6CD5;&#x7684;&#x4F8B;&#x5B50;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">push</span>(<span class="hljs-params">array, ...items</span>) </span>{ 
  items.forEach(<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">item</span>) </span>{
    array.push(item);
    <span class="hljs-built_in">console</span>.log(item);
  });
}

<span class="hljs-keyword">var</span> a = [];
push(a, <span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>)
</code></pre>
<p>&#x6CE8;&#x610F;&#xFF0C;rest&#x53C2;&#x6570;&#x4E4B;&#x540E;&#x4E0D;&#x80FD;&#x518D;&#x6709;&#x5176;&#x4ED6;&#x53C2;&#x6570;&#xFF0C;&#x5426;&#x5219;&#x4F1A;&#x62A5;&#x9519;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-comment">// &#x62A5;&#x9519;</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f</span>(<span class="hljs-params">a, ...b, c</span>) </span>{ 
  <span class="hljs-comment">// ...</span>
}
</code></pre>
<h2 id="%E6%89%A9%E5%B1%95%E8%BF%90%E7%AE%97%E7%AC%A6">&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;</h2>
<p>&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;&#xFF08;spread&#xFF09;&#x662F;&#x4E09;&#x4E2A;&#x70B9;&#xFF08;...&#xFF09;&#x3002;&#x5B83;&#x597D;&#x6BD4;rest&#x53C2;&#x6570;&#x7684;&#x9006;&#x8FD0;&#x7B97;&#xFF0C;&#x5C06;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#x8F6C;&#x4E3A;&#x7528;&#x9017;&#x53F7;&#x5206;&#x9694;&#x7684;&#x53C2;&#x6570;&#x5E8F;&#x5217;&#x3002;&#x8BE5;&#x8FD0;&#x7B97;&#x7B26;&#x4E3B;&#x8981;&#x7528;&#x4E8E;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">push</span>(<span class="hljs-params">array, ...items</span>) </span>{
  array.push(...items);
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">add</span>(<span class="hljs-params">x, y</span>) </span>{
  <span class="hljs-keyword">return</span> x + y;
}

<span class="hljs-keyword">var</span> numbers = [<span class="hljs-number">4</span>, <span class="hljs-number">38</span>];
add(...numbers) <span class="hljs-comment">// 42</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>array.push(...items)</code>&#x548C;<code>add(...numbers)</code>&#x8FD9;&#x4E24;&#x884C;&#xFF0C;&#x90FD;&#x662F;&#x51FD;&#x6570;&#x7684;&#x8C03;&#x7528;&#xFF0C;&#x5B83;&#x4EEC;&#x7684;&#x90FD;&#x4F7F;&#x7528;&#x4E86;&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;&#x3002;&#x8BE5;&#x8FD0;&#x7B97;&#x7B26;&#x5C06;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#xFF0C;&#x53D8;&#x4E3A;&#x53C2;&#x6570;&#x5E8F;&#x5217;&#x3002;</p>
<p>&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;&#x53EF;&#x4EE5;&#x7B80;&#x5316;&#x6C42;&#x51FA;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#x6700;&#x5927;&#x5143;&#x7D20;&#x7684;&#x5199;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-comment">// ES5</span>
<span class="hljs-built_in">Math</span>.max.apply(<span class="hljs-literal">null</span>, [<span class="hljs-number">14</span>, <span class="hljs-number">3</span>, <span class="hljs-number">77</span>])

<span class="hljs-comment">// ES6</span>
<span class="hljs-built_in">Math</span>.max(...[<span class="hljs-number">14</span>, <span class="hljs-number">3</span>, <span class="hljs-number">77</span>])

<span class="hljs-comment">// &#x7B49;&#x540C;&#x4E8E;</span>
<span class="hljs-built_in">Math</span>.max(<span class="hljs-number">14</span>, <span class="hljs-number">3</span>, <span class="hljs-number">77</span>);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8868;&#x793A;&#xFF0C;&#x7531;&#x4E8E;JavaScript&#x4E0D;&#x63D0;&#x4F9B;&#x6C42;&#x6570;&#x7EC4;&#x6700;&#x5927;&#x5143;&#x7D20;&#x7684;&#x51FD;&#x6570;&#xFF0C;&#x6240;&#x4EE5;&#x53EA;&#x80FD;&#x5957;&#x7528;Math.max&#x51FD;&#x6570;&#xFF0C;&#x5C06;&#x6570;&#x7EC4;&#x8F6C;&#x4E3A;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x5E8F;&#x5217;&#xFF0C;&#x7136;&#x540E;&#x6C42;&#x6700;&#x5927;&#x503C;&#x3002;&#x6709;&#x4E86;&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;&#x4EE5;&#x540E;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x7528;Math.max&#x4E86;&#x3002;</p>
<p>&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;&#x8FD8;&#x53EF;&#x4EE5;&#x7528;&#x4E8E;&#x6570;&#x7EC4;&#x7684;&#x8D4B;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-keyword">var</span> a = [<span class="hljs-number">1</span>];
<span class="hljs-keyword">var</span> b = [<span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">4</span>];
<span class="hljs-keyword">var</span> c = [<span class="hljs-number">6</span>, <span class="hljs-number">7</span>];
<span class="hljs-keyword">var</span> d = [<span class="hljs-number">0</span>, ...a, ...b, <span class="hljs-number">5</span>, ...c];

d
<span class="hljs-comment">// [0, 1, 2, 3, 4, 5, 6, 7]</span>
</code></pre>
<p>&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;&#x8FD8;&#x53EF;&#x4EE5;&#x5C06;&#x5B57;&#x7B26;&#x4E32;&#x8F6C;&#x4E3A;&#x771F;&#x6B63;&#x7684;&#x6570;&#x7EC4;&#x3002;</p>
<pre><code class="lang-javascript">
[...<span class="hljs-string">&quot;hello&quot;</span>] 
<span class="hljs-comment">// [ &quot;h&quot;, &quot;e&quot;, &quot;l&quot;, &quot;l&quot;, &quot;o&quot; ]</span>
</code></pre>
<p>&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;&#x5185;&#x90E8;&#x8C03;&#x7528;&#x7684;&#x662F;&#x6570;&#x636E;&#x7ED3;&#x6784;&#x7684;Iterator&#x63A5;&#x53E3;&#xFF0C;&#x56E0;&#x6B64;&#x53EA;&#x8981;&#x5177;&#x6709;Iterator&#x63A5;&#x53E3;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x90FD;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x6BD4;&#x5982;Map&#x7ED3;&#x6784;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-keyword">let</span> map = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Map</span>([
  [<span class="hljs-number">1</span>, <span class="hljs-string">&apos;one&apos;</span>],
  [<span class="hljs-number">2</span>, <span class="hljs-string">&apos;two&apos;</span>],
  [<span class="hljs-number">3</span>, <span class="hljs-string">&apos;three&apos;</span>],
]);


<span class="hljs-keyword">let</span> arr = [...map.keys()]; <span class="hljs-comment">// [1, 2, 3]</span>
</code></pre>
<p>Generator&#x51FD;&#x6570;&#x8FD0;&#x884C;&#x540E;&#xFF0C;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x904D;&#x5386;&#x5668;&#x5BF9;&#x8C61;&#xFF0C;&#x56E0;&#x6B64;&#x4E5F;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-keyword">var</span> go = <span class="hljs-function"><span class="hljs-keyword">function</span>*(<span class="hljs-params"></span>)</span>{
  <span class="hljs-keyword">yield</span> <span class="hljs-number">1</span>;
  <span class="hljs-keyword">yield</span> <span class="hljs-number">2</span>;
  <span class="hljs-keyword">yield</span> <span class="hljs-number">3</span>;
};

[...go()] <span class="hljs-comment">// [1, 2, 3]</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x53D8;&#x91CF;go&#x662F;&#x4E00;&#x4E2A;Generator&#x51FD;&#x6570;&#xFF0C;&#x6267;&#x884C;&#x540E;&#x8FD4;&#x56DE;&#x7684;&#x662F;&#x4E00;&#x4E2A;&#x904D;&#x5386;&#x5668;&#xFF0C;&#x5BF9;&#x8FD9;&#x4E2A;&#x904D;&#x5386;&#x5668;&#x6267;&#x884C;&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x5C31;&#x4F1A;&#x5C06;&#x5185;&#x90E8;&#x904D;&#x5386;&#x5F97;&#x5230;&#x7684;&#x503C;&#xFF0C;&#x8F6C;&#x4E3A;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#x3002;</p>
<h2 id="%E7%AE%AD%E5%A4%B4%E5%87%BD%E6%95%B0">&#x7BAD;&#x5934;&#x51FD;&#x6570;</h2>
<p>ES6&#x5141;&#x8BB8;&#x4F7F;&#x7528;&#x201C;&#x7BAD;&#x5934;&#x201D;&#xFF08;=&gt;&#xFF09;&#x5B9A;&#x4E49;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-keyword">var</span> f = v =&gt; v;
</code></pre>
<p>&#x4E0A;&#x9762;&#x7684;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x7B49;&#x540C;&#x4E8E;&#xFF1A;</p>
<pre><code class="lang-javascript">
<span class="hljs-keyword">var</span> f = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">v</span>) </span>{
    <span class="hljs-keyword">return</span> v;
};
</code></pre>
<p>&#x5982;&#x679C;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x4E0D;&#x9700;&#x8981;&#x53C2;&#x6570;&#x6216;&#x9700;&#x8981;&#x591A;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x5C31;&#x4F7F;&#x7528;&#x4E00;&#x4E2A;&#x5706;&#x62EC;&#x53F7;&#x4EE3;&#x8868;&#x53C2;&#x6570;&#x90E8;&#x5206;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-keyword">var</span> f = () =&gt; <span class="hljs-number">5</span>; 
<span class="hljs-comment">// &#x7B49;&#x540C;&#x4E8E;</span>
<span class="hljs-keyword">var</span> f = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>)</span>{ <span class="hljs-keyword">return</span> <span class="hljs-number">5</span> };

<span class="hljs-keyword">var</span> sum = (num1, num2) =&gt; num1 + num2;
<span class="hljs-comment">// &#x7B49;&#x540C;&#x4E8E;</span>
<span class="hljs-keyword">var</span> sum = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">num1, num2</span>) </span>{
    <span class="hljs-keyword">return</span> num1 + num2;
};
</code></pre>
<p>&#x5982;&#x679C;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x7684;&#x4EE3;&#x7801;&#x5757;&#x90E8;&#x5206;&#x591A;&#x4E8E;&#x4E00;&#x6761;&#x8BED;&#x53E5;&#xFF0C;&#x5C31;&#x8981;&#x4F7F;&#x7528;&#x5927;&#x62EC;&#x53F7;&#x5C06;&#x5B83;&#x4EEC;&#x62EC;&#x8D77;&#x6765;&#xFF0C;&#x5E76;&#x4E14;&#x4F7F;&#x7528;return&#x8BED;&#x53E5;&#x8FD4;&#x56DE;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-keyword">var</span> sum = (num1, num2) =&gt; { <span class="hljs-keyword">return</span> num1 + num2; }
</code></pre>
<p>&#x7531;&#x4E8E;&#x5927;&#x62EC;&#x53F7;&#x88AB;&#x89E3;&#x91CA;&#x4E3A;&#x4EE3;&#x7801;&#x5757;&#xFF0C;&#x6240;&#x4EE5;&#x5982;&#x679C;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x76F4;&#x63A5;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x5FC5;&#x987B;&#x5728;&#x5BF9;&#x8C61;&#x5916;&#x9762;&#x52A0;&#x4E0A;&#x62EC;&#x53F7;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-keyword">var</span> getTempItem = id =&gt; ({ id: id, name: <span class="hljs-string">&quot;Temp&quot;</span> });
</code></pre>
<p>&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x7684;&#x4E00;&#x4E2A;&#x7528;&#x5904;&#x662F;&#x7B80;&#x5316;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-comment">// &#x6B63;&#x5E38;&#x51FD;&#x6570;&#x5199;&#x6CD5;</span>
[<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>].map(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">x</span>) </span>{
  <span class="hljs-keyword">return</span> x * x;
});

<span class="hljs-comment">// &#x7BAD;&#x5934;&#x51FD;&#x6570;&#x5199;&#x6CD5;</span>
[<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>].map(x =&gt; x * x);
</code></pre>
<p>&#x53E6;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x662F;</p>
<pre><code class="lang-javascript">
<span class="hljs-comment">// &#x6B63;&#x5E38;&#x51FD;&#x6570;&#x5199;&#x6CD5;</span>
<span class="hljs-keyword">var</span> result = values.sort(<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">a, b</span>) </span>{
    <span class="hljs-keyword">return</span> a - b;
});

<span class="hljs-comment">// &#x7BAD;&#x5934;&#x51FD;&#x6570;&#x5199;&#x6CD5;</span>
<span class="hljs-keyword">var</span> result = values.sort((a, b) =&gt; a - b);
</code></pre>
<p>&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x6709;&#x51E0;&#x4E2A;&#x4F7F;&#x7528;&#x6CE8;&#x610F;&#x70B9;&#x3002;</p>
<ul>
<li>&#x51FD;&#x6570;&#x4F53;&#x5185;&#x7684;this&#x5BF9;&#x8C61;&#xFF0C;&#x7ED1;&#x5B9A;&#x5B9A;&#x4E49;&#x65F6;&#x6240;&#x5728;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x4F7F;&#x7528;&#x65F6;&#x6240;&#x5728;&#x7684;&#x5BF9;&#x8C61;&#x3002;</li>
<li>&#x4E0D;&#x53EF;&#x4EE5;&#x5F53;&#x4F5C;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;&#x4E0D;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;new&#x547D;&#x4EE4;&#xFF0C;&#x5426;&#x5219;&#x4F1A;&#x629B;&#x51FA;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;&#x3002;</li>
<li>&#x4E0D;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;arguments&#x5BF9;&#x8C61;&#xFF0C;&#x8BE5;&#x5BF9;&#x8C61;&#x5728;&#x51FD;&#x6570;&#x4F53;&#x5185;&#x4E0D;&#x5B58;&#x5728;&#x3002; </li>
</ul>
<p>&#x4E0A;&#x9762;&#x4E09;&#x70B9;&#x4E2D;&#xFF0C;&#x7B2C;&#x4E00;&#x70B9;&#x5C24;&#x5176;&#x503C;&#x5F97;&#x6CE8;&#x610F;&#x3002;this&#x5BF9;&#x8C61;&#x7684;&#x6307;&#x5411;&#x662F;&#x53EF;&#x53D8;&#x7684;&#xFF0C;&#x4F46;&#x662F;&#x5728;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x4E2D;&#xFF0C;&#x5B83;&#x662F;&#x56FA;&#x5B9A;&#x7684;&#x3002;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x662F;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#xFF0C;&#x5C06;this&#x5BF9;&#x8C61;&#x7ED1;&#x5B9A;&#x5B9A;&#x4E49;&#x65F6;&#x6240;&#x5728;&#x7684;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript">
<span class="hljs-keyword">var</span> handler = {

    id: <span class="hljs-string">&quot;123456&quot;</span>,

    init: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{
        <span class="hljs-built_in">document</span>.addEventListener(<span class="hljs-string">&quot;click&quot;</span>,
            event =&gt; <span class="hljs-keyword">this</span>.doSomething(event.type), <span class="hljs-literal">false</span>);
    },

    doSomething: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">type</span>) </span>{
        <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&quot;Handling &quot;</span> + type  + <span class="hljs-string">&quot; for &quot;</span> + <span class="hljs-keyword">this</span>.id);
    }
};
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;init&#x65B9;&#x6CD5;&#x4E2D;&#xFF0C;&#x4F7F;&#x7528;&#x4E86;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#xFF0C;&#x8FD9;&#x5BFC;&#x81F4;this&#x7ED1;&#x5B9A;handler&#x5BF9;&#x8C61;&#xFF0C;&#x5426;&#x5219;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x8FD0;&#x884C;&#x65F6;&#xFF0C;this.doSomething&#x8FD9;&#x4E00;&#x884C;&#x4F1A;&#x62A5;&#x9519;&#xFF0C;&#x56E0;&#x4E3A;&#x6B64;&#x65F6;this&#x6307;&#x5411;&#x5168;&#x5C40;&#x5BF9;&#x8C61;&#x3002;</p>
<p>&#x7531;&#x4E8E;this&#x5728;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x4E2D;&#x88AB;&#x7ED1;&#x5B9A;&#xFF0C;&#x6240;&#x4EE5;&#x4E0D;&#x80FD;&#x7528;call()&#x3001;apply()&#x3001;bind()&#x8FD9;&#x4E9B;&#x65B9;&#x6CD5;&#x53BB;&#x6539;&#x53D8;this&#x7684;&#x6307;&#x5411;&#x3002;</p>
<p>&#x957F;&#x671F;&#x4EE5;&#x6765;&#xFF0C;JavaScript&#x8BED;&#x8A00;&#x7684;this&#x5BF9;&#x8C61;&#x4E00;&#x76F4;&#x662F;&#x4E00;&#x4E2A;&#x4EE4;&#x4EBA;&#x5934;&#x75DB;&#x7684;&#x95EE;&#x9898;&#xFF0C;&#x5728;&#x5BF9;&#x8C61;&#x65B9;&#x6CD5;&#x4E2D;&#x4F7F;&#x7528;this&#xFF0C;&#x5FC5;&#x987B;&#x975E;&#x5E38;&#x5C0F;&#x5FC3;&#x3002;&#x7BAD;&#x5934;&#x51FD;&#x6570;&#x7ED1;&#x5B9A;this&#xFF0C;&#x5F88;&#x5927;&#x7A0B;&#x5EA6;&#x4E0A;&#x89E3;&#x51B3;&#x4E86;&#x8FD9;&#x4E2A;&#x56F0;&#x6270;&#x3002;</p>

                    
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